r0 = syz_open_procfs(0x0, &(0x7f0000000480)='gid_map\x00')
preadv2(r0, &(0x7f0000000140)=[{&(0x7f00000004c0)=""/4096, 0x1000}], 0x1, 0x0, 0x0, 0x10)